Winter morning.

The sun shines through the morning mist on the streets and alleys of Lianhai City.

There are few pedestrians on the street, and occasionally a few uncles and aunts who get up early to buy vegetables pass by.

In the urban area with high-rise buildings, a flock of pigeons flew in the air, making a strange sound.

"What is this sound? Sounds familiar. "The aunt who bought vegetables on the street asked the uncle.

"The sound of a pigeon's whistle." The uncle replied, "It's the sound of pigeons grazing in the old BJ alley on TV before." ”

"When you say that, I remember that I often hear this sound on TV, as if a pigeon is tied to a pigeon's tail or wings with a special pigeon whistle, and when the pigeon flies, the pigeon whistle will make all kinds of sounds." The grocery shopping aunt looked up at the flock of pigeons in the air.

The route of the pigeon flock is in the shape of a circle, and the center of the route is a residential building.

"The pigeon seems to be flying around the Xinhai Garden Community." The vegetable seller stared at the flock of pigeons and quickly came to a conclusion.

"This group of pigeons was raised by Old Man Zhang from Xinhai Garden."

"How do you know?"

The grocery buyer began to gossip about what he knew, "There are a lot of pigeons in our area, but the one who likes to tinker with these old things must be the old man Zhang, who lives in our Xinhai Garden Community, he retired from the city museum, and has a façade house and a house on the top floor of Building 14 in the community." The façade was rented out, he lived on the top floor, he had no children and no daughters, and he usually liked to play chess and raise pigeons, and his pigeons were kept in the attic and the open balcony on the top floor. ”

"You know a lot."

"Of course, I am a chess friend with Old Man Zhang, and the last time he played chess, he said that he was making his own pigeon whistle."

"No wonder I didn't hear this sound before, it turned out to be a pigeon whistle just made by Old Man Zhang."

The grocery shopping aunt and uncle are walking back with the vegetables, discussing the history of the pigeon whistle and the characteristics of making various sounds as they walk.

Not far away, in a 7-storey building in the Xinhai Garden Community, a flock of pigeons parked on the roof of the building and gathered around the owner who had just appeared.

The owner of the flock is an old man in his 60s, with short gray hair, a lean build, dressed in white casual clothes, and holding a mixture of pigeon food.

Now is the time to feed the flock with breakfast, and the pigeons are staring at the food in their owners' hands.

The old man sprinkled pigeon food on the roof of the building, and the pigeons rushed up and scrambled for food.

"Ahem...... The cold wind of the winter morning blew, and the old man coughed again and again.

There was a large pigeon cage on the roof of the building, placed on the root of the fence on one side, and a lot of pigeon droppings had accumulated in the cage, and the old man took a small shovel and began to clean it.

"Ahem......" the old man continued to cough.

"Hey...... It's not cold this winter, why am I still coughing? My head still hurts, don't you have a cold from the cold, right? I'll have to go to the hospital tomorrow. The old man muttered to himself.

Two pigeons were fighting for food on the roof wall, and the old man was so distraught that he got up to drive them away.

The pigeon was driven off the wall, but the old man suddenly felt dizzy and unsteady on his feet.

A cold wind blew, and the old man threw his head out of the wall, and his body fell straight from the top of the seven-story building.

The body smashed the drying rack outside the window on the sixth floor, continued to fall, and finally stuck on the peripheral grid that was temporarily renovated by the residents on the second floor.

The uncle and aunt who were shopping for vegetables were passing downstairs when they heard the sound and looked up to see the thrilling scene just now.

The grocery shopping aunt was so shocked that the vegetable basket in her hand fell to the ground, "Someone fell downstairs!" ”

The grocery shopping uncle calmed down a little and took a closer look, "Oh, isn't that old man Zhang, he lives on the top floor of this building, why did he fall down?" Quick, save people. ”

The shouts of the uncle and aunt alarmed the nearby residents, and everyone got the old man Zhang from the grid on the second floor to the ground.

"Old man Zhang, what do you think?" The grocery buyer asked with concern.

Old man Zhang's eyes were glazed, as if he wanted to speak, and when he opened his mouth, he squirted out a puddle of yellow viscous liquid.

He threw up!

Or projectile vomiting.

The vomit squirted far away, and some of it stuck to the crowd of onlookers.

The grocery buyer closest to Old Man Zhang has the most.

As Old Man Zhang's chess friend, the vegetable buyer did not dislike it at this time, but used the cotton handkerchief in his pocket to wipe Old Man Zhang's mouth with concern, "Old Man Zhang, don't be afraid, I have already called 120 ambulances, and they will come soon." ”

The grocery shopping uncle thought that the old man Zhang vomited because he was frightened after falling from the building, so he comforted him again and again.

But the words of comfort did not work, and the old man vomited twice more, and his consciousness began to become blurred until the ambulance arrived and he was carried into the car and taken away.

——

Lianhai First People's Hospital, emergency room.

The emergency doctor is treating Old Man Zhang.

On basic examination, the body temperature is 39°C, there are symptoms of vomiting, neck stiffness, and confusion.

The emergency nurse reported to the doctor, "The neighbor who came with the ambulance reported that the patient fell from the seventh floor, smashed the drying rack on the sixth floor, and was finally stuck on the protective net on the second floor. ”

The emergency doctor examined the old man again.

"There were no injuries from a fall from a height, and blood and cerebrospinal fluid were drawn at the ready."

The nurse drew two tubes of blood from the elbow socket of the old man, and then turned the old man to his side, and the doctor began to prepare to draw the cerebrospinal fluid.

A long, thin needle enters the spine and cerebrospinal fluid flows out slowly.

It was supposed to be clear cerebrospinal fluid, but what came out at this time was a cloudy milky white.

The emergency doctor frowned slightly, "The patient is an infectious disease, and it has nothing to do with falling from the building, notify the infection department, and a patient has been transferred." ”

——

9:10 a.m.

Xinhai Garden Community.

The place where Old Man Zhang fell was cordoned off, and there were a large number of onlookers nearby.

Because someone called the police, the police came to investigate the incident of Old Man Zhang's fall from the building.

Gu's mother and Gu's father also live in Building 14 of Xinhai Garden Community, and when a major incident occurs in the community, they are still neighbors in a building, and the two also came with the crowd to see what was going on.

The cordon was surrounded by a crowd of onlookers.

Gu's mother and Gu's father listened to everyone's discussion outside the crowd.

"I heard that it was the old man Zhang who lived alone who fell from the building."

"Yes, Old Man Zhang lives on the top floor, raising a flock of pigeons, and there are strange sounds when the pigeons are released every day."

"That's the sound of a pigeon's whistle."

"Why did Old Man Zhang fall from the building? He usually plays chess and raises birds, and he doesn't have any enemies, right? ”

"In these days, playing chess will also offend people, do you remember a few days ago the Internet reported that a young man watched two old people on the side of the road play chess, said a few more words, and as a result, they fought and bit off one of each other's ears."

"Tut-tut, it's too scary, did Old Man Zhang offend people when he was playing chess, so someone pushed him downstairs?"

"Who knows, if Old Man Zhang wasn't pushed downstairs, then what did the police do here?"

"Yes, there must be something wrong here, the police should be looking for this murderer now."

Gu's mother, who had been quietly watching from the side, couldn't listen to it, "How can there be any murderer?" Old man Zhang is usually the most kind person and will not make enemies with others, there must be other reasons for him to fall from the building. ”

There was an old lady in the crowd of onlookers, who was also a resident of the community, who lived in Building 13 next door, and was not satisfied with Gu's mother's statement, so she pursed her lips and said: "Gu's mother, you can't speak so arbitrarily, how can Old Man Zhang not make enemies with others?" I've seen him quarrel with people when he played chess, even his pigeons flew around, and a few of them even liked to poop on my balcony! ”